Letro is intended for use only by women who are no longer of childbearing age. Possible candidates must have already ceased to menstruate. It is often used in patients who have already undergone other cancer treatments, such as radiation, chemotherapy, and used other cancer medication nolvadex. This nonsteroidal aromatase inhibitor may help prevent any remaining cancer cells from spreading.

Femara is used for the treatment of post-menopause breast cancer.Femara is a powerful Aromatase Inhibitor that was developed to fight breast cancer. For athletes and bodybuilders, it is a medication used to combat the estrogenic side effects of anabolic steroids water-retention, acne and gynocomastia. It will also raise test levels because of the lowered estrogen in the body.